Estimation of Fano factor in inorganic scintillators

被引：12

作者：

Bora, Vaibhav ^{[1
,2
]}

Barrett, Harrison H. ^{[1
,2
]}

Fastje, David ^{[1
,2
]}

Clarkson, Eric ^{[1
,2
]}

Furenlid, Lars ^{[1
,2
]}

Bousselham, Abdelkader ^{[3
]}

Shah, Kanai S. ^{[4
]}

Glodo, Jarek ^{[4
]}

机构：

[1] Univ Arizona, Ctr Gamma Ray Imaging, Dept Med Imaging, Tucson, AZ 85724 USA

[2] Univ Arizona, Coll Opt Sci, Tucson, AZ 85724 USA

[3] Qatar Fdn, QEERI, Doha, Qatar

[4] Radiat Monitoring Devices Inc, Watertown, MA 02472 USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2016年 / 805卷

关键词：

Fano factor; Inorganic scintillators; Renewal point process; Photon statistics; RESOLUTION;

D O I：

10.1016/j.nima.2015.07.009

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The Fano factor of an integer-valued random variable is defined as the ratio of its variance to its mean. Correlation between the outputs of two photomultiplier tubes on opposite faces of a scintillation crystal was used to estimate the Fano factor of photoelectrons and scintillation photons. Correlations between the integrals of the detector outputs were used to estimate the photoelectron and photon Fano factor for YAP:Ce, SrI2:Eu and Csl:Na scintillator crystals. At 662 keV, SrI2:Eu was found to be sub-Poisson, while Csl:Na and YAP:Ce were found to be super-Poisson. An experiment setup inspired from the Hanbury Brown and Twiss experiment was used to measure the correlations as a function of time between the outputs of two photomultiplier tubes looking at the same scintillation event. A model of the scintillation and the detection processes was used to generate simulated detector outputs as a function of time for different values of Fano factor. The simulated outputs from the model for different Fano factors was compared to the experimentally measured detector outputs to estimate the Fano factor of the scintillation photons for YAP:Ce, LaBr3:Ce scintillator crystals. At 662 keV, LaBr3:Ce was found to be sub-Poisson, while YAP:Ce was found to be close to Poisson. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：72 / 86

页数：15

共 25 条

[1]

[Anonymous], 1998, An introduction to stochastic modeling

[2]

[Anonymous], 2000, Principles of optics: electromagnetic theory of propagation, interference and diffraction of light

[3]

[Anonymous], 1962, Stochastic processes holden-day

[4]

[Anonymous], 2010, Laws of small numbers: extremes and rare events

[5]

[Anonymous], 2004, Foundations of Image Science

[6]

Barrett H.H., 1981, RADIOLOGICAL IMAGING

[7]

Bora V, 2011, IEEE NUCL SCI CONF R, P987, DOI 10.1109/NSSMIC.2011.6154307

[8] Photoelectron anticorrelations and sub-Poisson statistics in scintillation detectors [J].

Bousselham, Abdelkader ;

Barrett, Harrison H. ;

Bora, Vaibhav ;

Shah, Kanai .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2010, 620 (2-3) :359-362

[9]

Brown R.H., 1959, PHILOS MAG, V7, P663

[10] HOMOPHASE AND HETEROPHASE FLUCTUATIONS IN SEMICONDUCTING CRYSTALS [J].

BURGESS, RE .

DISCUSSIONS OF THE FARADAY SOCIETY, 1959, (28) :151-158

← 1 2 3 →